Fabrication of microporous PBI membranes with narrow pore size d

Details Fabrication of microporous PBI membranes with narrow pore size d Fabrication of microporous PBI membranes with narrow pore size d

1990-06-25

1992-02-25

Spear, Frank

Liquid purification or separation

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264 49, B01D 6906

Patent

active

050910876

ABSTRACT:
A microporous polybenzimidazole membrane having a uniform pore structure and a narrow pore size distribution, and a process for making the membrane. The process requires coating a polybenzimidazole powder with a high temperature stable polymer and compression molding the coated particles at a temperature in the approximate range of 435.degree.-450.degree. C. to form a sheet or membrane. The polymer is then extracted from the sheet, leaving a fine, uniform, polybenzimidazole microporous structure.

REFERENCES:
patent: 3797494 (1974-03-01), Zaffaroni
patent: 4717619 (1988-01-01), Letinski
patent: 4828699 (1989-05-01), Soehngen

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